From e715772dbf71546cf0a47c89f9f56d9ac1743b5e Mon Sep 17 00:00:00 2001
From: InsanusMokrassar <ovsyannikov.alexey95@gmail.com>
Date: Thu, 17 Jun 2021 13:39:02 +0600
Subject: [PATCH] fill changes

---
 CHANGELOG.md                                  |  8 +++++
 android/recyclerview/build.gradle             |  1 +
 .../recyclerview/RecyclerViewAdapter.kt       | 16 ++++++++-
 .../StateFlowBasedRecyclerViewAdapter.kt      | 33 +++++++++++++++++++
 .../inmo/micro_utils/common/Annotations.kt    |  2 +-
 .../inmo/micro_utils/common/ViewVisibility.kt |  4 +--
 6 files changed, 60 insertions(+), 4 deletions(-)
 create mode 100644 android/recyclerview/src/main/kotlin/dev/inmo/micro_utils/android/recyclerview/StateFlowBasedRecyclerViewAdapter.kt

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 663061f3827..7cb0d97306a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 ## 0.5.12
 
+* `Common`:
+    * `Android`
+        * Extension `View#changeVisibility` has been fixed
+* `Android`
+    * `RecyclerView`
+        * Default adapter got `dataCountFlow` property
+        * New subtype of adapter based on `StateFlow`: `StateFlowBasedRecyclerViewAdapter`
+
 ## 0.5.11
 
 * `Repos`:
diff --git a/android/recyclerview/build.gradle b/android/recyclerview/build.gradle
index e0ca77546ee..1357ac98f51 100644
--- a/android/recyclerview/build.gradle
+++ b/android/recyclerview/build.gradle
@@ -11,6 +11,7 @@ kotlin {
         commonMain {
             dependencies {
                 api "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlin_coroutines_version"
+                api project(":micro_utils.common")
             }
         }
         androidMain {
diff --git a/android/recyclerview/src/main/kotlin/dev/inmo/micro_utils/android/recyclerview/RecyclerViewAdapter.kt b/android/recyclerview/src/main/kotlin/dev/inmo/micro_utils/android/recyclerview/RecyclerViewAdapter.kt
index a5dc0e93450..b314ce2a3dd 100644
--- a/android/recyclerview/src/main/kotlin/dev/inmo/micro_utils/android/recyclerview/RecyclerViewAdapter.kt
+++ b/android/recyclerview/src/main/kotlin/dev/inmo/micro_utils/android/recyclerview/RecyclerViewAdapter.kt
@@ -3,11 +3,19 @@ package dev.inmo.micro_utils.android.recyclerview
 import android.view.View
 import android.view.ViewGroup
 import androidx.recyclerview.widget.RecyclerView
+import kotlinx.coroutines.flow.*
 
 
 abstract class RecyclerViewAdapter<T>: RecyclerView.Adapter<AbstractViewHolder<T>>() {
     protected abstract val data: List<T>
 
+    private val _dataCountState by lazy {
+        MutableStateFlow<Int>(data.size)
+    }
+    val dataCountState: StateFlow<Int> by lazy {
+        _dataCountState.asStateFlow()
+    }
+
     var emptyView: View? = null
         set(value) {
             field = value
@@ -19,31 +27,37 @@ abstract class RecyclerViewAdapter<T>: RecyclerView.Adapter<AbstractViewHolder<T
             object : RecyclerView.AdapterDataObserver() {
                 override fun onItemRangeChanged(positionStart: Int, itemCount: Int) {
                     super.onItemRangeChanged(positionStart, itemCount)
+                    _dataCountState.value = data.size
                     checkEmpty()
                 }
 
                 override fun onItemRangeChanged(positionStart: Int, itemCount: Int, payload: Any?) {
                     super.onItemRangeChanged(positionStart, itemCount, payload)
+                    _dataCountState.value = data.size
                     checkEmpty()
                 }
 
                 override fun onChanged() {
                     super.onChanged()
+                    _dataCountState.value = data.size
                     checkEmpty()
                 }
 
                 override fun onItemRangeRemoved(positionStart: Int, itemCount: Int) {
                     super.onItemRangeRemoved(positionStart, itemCount)
+                    _dataCountState.value = data.size
                     checkEmpty()
                 }
 
                 override fun onItemRangeMoved(fromPosition: Int, toPosition: Int, itemCount: Int) {
                     super.onItemRangeMoved(fromPosition, toPosition, itemCount)
+                    _dataCountState.value = data.size
                     checkEmpty()
                 }
 
                 override fun onItemRangeInserted(positionStart: Int, itemCount: Int) {
                     super.onItemRangeInserted(positionStart, itemCount)
+                    _dataCountState.value = data.size
                     checkEmpty()
                 }
             }
@@ -59,7 +73,7 @@ abstract class RecyclerViewAdapter<T>: RecyclerView.Adapter<AbstractViewHolder<T
 
     private fun checkEmpty() {
         emptyView ?. let {
-            if (data.isEmpty()) {
+            if (dataCountState.value == 0) {
                 it.visibility = View.VISIBLE
             } else {
                 it.visibility = View.GONE
diff --git a/android/recyclerview/src/main/kotlin/dev/inmo/micro_utils/android/recyclerview/StateFlowBasedRecyclerViewAdapter.kt b/android/recyclerview/src/main/kotlin/dev/inmo/micro_utils/android/recyclerview/StateFlowBasedRecyclerViewAdapter.kt
new file mode 100644
index 00000000000..d13141c006d
--- /dev/null
+++ b/android/recyclerview/src/main/kotlin/dev/inmo/micro_utils/android/recyclerview/StateFlowBasedRecyclerViewAdapter.kt
@@ -0,0 +1,33 @@
+package dev.inmo.micro_utils.android.recyclerview
+
+import dev.inmo.micro_utils.common.Diff
+import dev.inmo.micro_utils.common.PreviewFeature
+import kotlinx.coroutines.*
+import kotlinx.coroutines.flow.*
+
+@PreviewFeature("This feature in preview state and may contains different bugs. " +
+                "Besides, this feature can be changed in future in non-compatible way")
+abstract class StateFlowBasedRecyclerViewAdapter<T>(
+    listeningScope: CoroutineScope,
+    dataState: StateFlow<List<T>>
+) : RecyclerViewAdapter<T>() {
+    override var data: List<T> = emptyList()
+
+    init {
+        dataState.onEach {
+            val diff = Diff(data, it)
+            data = it
+            withContext(Dispatchers.Main) {
+                diff.removed.forEach {
+                    notifyItemRemoved(it.index)
+                }
+                diff.replaced.forEach { (from, to) ->
+                    notifyItemMoved(from.index, to.index)
+                }
+                diff.added.forEach {
+                    notifyItemInserted(it.index)
+                }
+            }
+        }.launchIn(listeningScope)
+    }
+}
diff --git a/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/Annotations.kt b/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/Annotations.kt
index 7873443768c..11eb33e07f5 100644
--- a/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/Annotations.kt
+++ b/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/Annotations.kt
@@ -16,7 +16,7 @@ package dev.inmo.micro_utils.common
     AnnotationTarget.TYPEALIAS,
     AnnotationTarget.TYPE_PARAMETER
 )
-annotation class PreviewFeature
+annotation class PreviewFeature(val message: String = "It is possible, that behaviour of this thing will be changed or removed in future releases")
 
 @RequiresOptIn(
     "This thing is marked as warned. See message of warn to get more info",
diff --git a/common/src/main/kotlin/dev/inmo/micro_utils/common/ViewVisibility.kt b/common/src/main/kotlin/dev/inmo/micro_utils/common/ViewVisibility.kt
index 5c842f98883..ff636008564 100644
--- a/common/src/main/kotlin/dev/inmo/micro_utils/common/ViewVisibility.kt
+++ b/common/src/main/kotlin/dev/inmo/micro_utils/common/ViewVisibility.kt
@@ -36,12 +36,12 @@ fun View.toggleVisibility(goneOnHide: Boolean = true) {
 
 fun View.changeVisibility(show: Boolean = !isShown, goneOnHide: Boolean = true) {
     if (show) {
+        show()
+    } else {
         if (goneOnHide) {
             gone()
         } else {
             hide()
         }
-    } else {
-        show()
     }
 }